Research On Speed Control Strategy Of Micro Gas Turbine

Since the beginning of the new century,rapid economic development and rapid population expansion have brought unprecedented pressure and challenges to the global energy environment.Under such an urgent situation,mankind urgently needs to find other new energy sources to replace traditional fossil energy sources in order to alleviate the excessive consumption of fossil energy sources and the environmental pollution caused by burning fossil energy sources.Therefore,new and more environmentally friendly distributed energy sources have emerged and developed and promoted rapidly,and have occupied a place in the original fossil energy market.Among them,micro gas turbines have received more and more attention from the state and society because of their advantages of small equipment,low investment,high energy utilization rate,and diversified operation modes.However,due to the complex structure of the gas turbine system,high nonlinearity,and strong variable coupling,the actual speed control effect of the micro gas turbine is always unsatisfactory.In view of the above problems,combined with the existing more mature control theory,this topic has developed some practical and effective control methods in the micro gas turbine speed control strategy.Firstly,this paper introduces the significance of using gas turbine and the related research results at home and abroad,then gives the structure and function of micro gas turbine and the nonlinear mathematical model of its related modules,and linearizes the model,gives the system state equation and the relevant parameters in the equation after the linearization.According to the linearized mathematical model,comprehensively considering fixed-time control theory and sliding mode variable structure control theory,an adaptive fixed-time sliding mode control method is proposed.The effectiveness of the control method is proved by Lyapunov stability theory.It not only has the characteristics of sliding mode variable structure control which is insensitive to system parameters and strong robustness,but also meets the relevant requirements of fixed time stability.It can be quickly stabilized within a certain time limit under any initial value.Then for the chattering problem caused by sliding mode variable structure control,a method of fuzzy adaptive control is proposed to minimize the impact of chattering on system stability.And through MATLAB simulation to validate the above theoretical conjecture.In order to improve control accuracy and adapt to complex applications more easily,Chapter 5 of this paper designs a fixed-time sliding mode controller and a fuzzy adaptive fixed-time sliding mode controller for the classic fourth-order Rowen model of gas turbines.The numerical simulations of the two controllers are performed separately.The results show that in the fourth-order system,the two control methods can still combine the advantages of several control methods into one,and can be used at a fixed time without depending on the initial value.It is fast and stable within the upper limit,and it is robust,and fuzzy adaptive control can limit the jitter amplitude of system state variables.The thesis has 29 figures,3 tables,and 91 references.